Bengaluru-based deep-tech startup Nexstem has raised $3.5 million in a funding round led by InfoEdge, Zupee, Smile Group, and Gruhas.Nexstem focuses on developing non-invasive Brain Computer Interface (BCI) solutions.The funding will be used to scale its product ecosystem, expand the IP portfolio, and disrupt the neurotech sector.Nexstem plans to launch new products, expand globally, and address real-world challenges in diverse sectors through their BCI ecosystem.